Justin MillerFormer Dodgers PitcherFound Dead

6/29/2013 12:32 AM PDT BY TMZ STAFF

Former MLB Pitcher Justin Miller has been found dead ... and cause of death is a mystery.

The 35-year-old's body was discovered Wednesday night in Palm Harbor, FL -- where he was living -- but authorities have not said exactly where.

Miller played in the Major Leagues for 15 seasons -- most recently for the L.A. Dodgers back in 2010. He also played for the Toronto Blue Jays, Florida Marlins and SF Giants.

He was best known for the large number of tattoos on his arms, which inspired the "Justin Miller Rule" in 2004 -- forcing him to wear long sleeves when he pitched, since players found his ink too distracting.

He's survived by his wife Jessica Miller and two sons. Jessica isn't giving any indication as to how he died, but does say it was sudden.